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An effective strategy for dendrite free Li metal anodes:Nickel foam decorated with high lattice-matching CoN and CoF_(2) nanosheets for dense deposition

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Nano Research 2024年第5期17卷 4069-4078页

作者： Wenlong Liu Jianzong Man Xiaodong sun Ning Zhang Yehong Du Kun Liu Zhongsheng Wen Song Li juncai sun Institute of Materials and Technology Dalian Maritime UniversityDalian 116026China Shandong Provinvial Key Laboratory of Chemical Energy Storage and Novel Cell Technology and School of Chemistry and Chemical enginneringLiaocheng UniversityLiaocheng 252000China Department of Public Security Management Liaoning Police CollegeDalian 116036China

The notorious dendrite and infinite volume change seriously restrict the advancement of lithium metal anodes(LMAs),during the long-term process of stripping/plating.Herein,the nanosheets of metal fluoride(CoF_(2))and metal nitride(CoN)with magnificent lithiophilicity on the nickel(Ni)foam are designed as the“regulator”to uniform the Li plating and build stronger solid electrolyte interface(SEI)layer for dendrite free LMAs.The Ni foam offers abundant space to receive deposited Li metal.The CoN nanosheets can guarantee the fast transfer of electrons,which provides a stable interface of Li^(+)reduction.Moreover,the nanosheet structure with lithiophilicity would accelerate the move of Li+and decrease the nucleation barrier,due to the high lattice-matching of Li and CoN.Meanwhile,the CoF_(2) could increase the content of F(LiF)in the SEI layer,which enhances the strength and avoids the destruction of SEI layer.With the cooperation of CoN and CoF_(2),the composited anode(Li/NF@CNCF)exhibits ultra-long cycle performance(more than 1200 h)and fantastic structure stability at 1 mA·cm^(-2) with 1 mAh·cm^(-2).Based on the LiFePO_(4) and Li/NF@CNCF,the full cells deliver excellent specifical capacity and steady coulombic efficiency.The strategy contributes an effective approach to alleviate the issues of lithium metal anodes in the field of LMAs.

关键词： CoN and CoF_(2) lattice-matching nanosheet lithiophilicity lithium metal anodes

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Experimental and simulation research on hollow AZ31 magnesium alloy three-channel joint by hot extrusion forming with sand mandrel

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Journal of Magnesium and Alloys 2024年第1期12卷 98-109页

作者： Shi Shengnan Wang Hongyu Teng Fei Jiang Lei sun juncai sun Jie Zhang Shunhu Transportation Engineering College Dalian Maritime UniversityDalianLiaoning 106026China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyangLiaoning 110819China Shagang School of Iron and Steel Soochow UniversitySuzhouJiangsu 215021China

Magnesium alloy is one of the lightest metal structural materials.The weight is further reduced through the hollow structure.However,the hollow structure is easily damaged during processing.In order to maintain the hollow structure and to transfer the stresses during the high temperature deformation,the sand mandrel is proposed.In this paper,the hollow AZ31 magnesium alloy three-channel joint is studied by hot extrusion forming.Sand as one of solid granule medium is used to fill the hollow magnesium alloy.The extrusion temperatures are 230℃ and 300℃,respectively.The process parameters(die angle,temperature,bottom thickness,sidewall thickness,edge-to-middle ratio in bottom,bottom shape)of the hollow magnesium alloy are analyzed based on the results of experiments and the finite element method.The results are shown that the formability of the hollow magnesium alloy will be much better when the ratio of sidewall thickness to the bottom thickness is 1:1.5.Also when edge-to-middle ratio in bottom is about 1:1.5,a better forming product can be received.The best bottom shape in these experiments will be convex based on the forming results.The grain will be refined obviously after the extrusion.Also the microstructures will be shown as streamlines.And these lines will be well agreement with the mold in the corner.

关键词： AZ31 magnesium alloy Three-channel joint Sand Experiments and the finite element Die angle

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Direct synthesis of tin spheres/nitrogen-doped porous carbon composite by self-formed template method for enhanced lithium storage

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Journal of Materials Science & Technology 2022年第9期104卷 88-97页

作者： Kun Liu Jia-ao Wang Hongfei Zheng Xiaodong sun Zhimo Yang Jianzong Man Xinyu Wang juncai sun Institute of Materials and Technology Dalian Maritime UniversityDalian 116026China Department of Chemistry and the Oden Institute for Computational Engineering and Sciences The University of Texas at AustinAustinTX78712-0165USA College of Materials Xiamen UniversityXiamen 361005China

To inhibit the agglomeration of tin-based nanomaterials and simplify the complicated synthesis process,a facile and eco-friendly self-formed template method is reported to synthesize tin submicron spheres dispersed in nitrogen-doped porous carbon(Sn/NPC)by pyrolysis of a mixture of disodium stannous citrate and urea.The vital point of this strategy is the formation of Na_(2)CO_(3)templates during pyrolysis.This self-formed Na_(2)CO_(3)acts as porous templates to support the formation of NPC.The obtained NPC provides good electronic conductivity,ample defects,and more active sites.Serving as anode for Li-ion batteries,the Sn/NPC electrode obtains a stable discharge capacity of 674.1 mAh/g after 150 cycles at 0.1 A/g.Especially,a high discharge capacity of 331.2 mAh/g can be achieved after 1100 cycles at 3 A/g.Additionally,a full cell coupled with LiCoO_(2)as cathode yields a discharge capacity of 524.8 mAh/g after 150 cycles at 0.1 A/g.In-situ XRD is implemented to investigate the alloying/dealloying reaction mechanisms.Density functional theory calculation ulteriorly explicates that NPC heightens intrinsic electronic conductivity,and NPC especially pyrrolic-N and pyridinic-N doping facilitates the Li-adsorption ability.Climbing image nudged elastic band method reveals low Li~+diffusion energy barrier in presence of N atoms,which accounts for the terrific electrochemical properties of Sn/NPC electrode.

关键词： Tin submicron spheres Nitrogen-doped porous carbon Self-formed template In-situ XRD Li-ion batteries

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Tunable oxygen vacancy concentration in vanadium oxide as mass-produced cathode for aqueous zinc-ion batteries

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Nano Research 2021年第3期14卷 754-761页

作者： Yehong Du Xinyu Wang juncai sun Institute of Materials and Technology Dalian Maritime UniversityDalian116026China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin300071China

Oxygen vacancy(Vö)is important in the modification of electrode for rechargeable batteries.However,due to the scarcity of suitable preparation strategy with controllable Vöincorporation,the impact of Vöconcentration on the electrochemical performances remains unclear.Thus,in this work,Vö-V_(2)O_(5)-PEDOT(VöVP)with tunable Vöconcentration is achieved via a spontaneous polymerization strategy,with the capability of mass-production.The introduction of poly(2,3-dihydrothieno-1,4-dioxin)(PEDOT)not only leads to the formation of Vöin V_(2)O_(5),but it also results in a larger interlayer spacing.The as-prepared Vö-V_(2)O_(5)-PEDOT-20.3%with Vöconcentration of 20.3%(denoted as VöVP-20)is able to exhibit high capacity of 449 mAh·g^(−1) at current density of 0.2 A·g^(−1),with excellent cyclic performance of 94.3% after 6,000 cycles.It is shown in the theoretical calculations that excessive Vöin V_(2)O_(5) will lead to an increase in the band gap,which inhibits the electrochemical kinetics and charge conductivity.This is further demonstrated in the experimental results as the electrochemical performance starts to decline when Vöconcentration increases beyond 20.3%.Thus,based on this work,scalable fabrication of high-performance electrode with tunable Vöconcentration can be achieved with the proposed strategy.

关键词： aqueous zinc-ion battery oxygen vacancy tunable vanadium oxide mass-produced

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A comprehensive review of natural products with anti-hypoxic activity

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Chinese Journal of Natural Medicines 2023年第7期21卷 499-515页

作者： LIU juncai GE Zhen JIANG Xiao ZHANG Jingjing sun Jianan MAO Xiangzhao College of Food Science and Engineering Ocean University of ChinaQingdao 266003China Medical College Qingdao Binhai UniversityQingdao 266555China Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Natural products exhibit substantial impacts in the field of anti-hypoxic traetment.Hypoxia can cause altitude sickness and other negative effect on the body.Headache,coma,exhaustion,vomiting and,in severe cases,death are some of the clinical signs.Currently,hypoxia is no longer just a concern in plateau regions;it is also one of the issues that can not be ignored by urban residents.This review covered polysaccharides,alkaloids,saponins,flavonoids,peptides and traditional Chinese compound prescriptions as natural products to protect against hypoxia.The active ingredients,effectiveness and mechanisms were discussed.The related anti-hypoxic mechanisms involve increasing the hemoglobin(HB)content,glycogen content and adenosine triphosphate(ATP)content,removing excessive reactive oxygen species(ROS),reducing lipid peroxidation,regulating the levels of related enzymes in cells,protecting the structural and functional integrity of the mitochondria and regulating the expression of apoptosis-related genes.These comprehensive summaries are beneficial to anti-hypoxic research and provide useful information for the development of anti-hypoxic products.

关键词： Natural products Anti-hypoxia Mechanism Activity

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Surface Molecular Encapsulation with Cyclodextrin in Promoting the Activity and Stability of Fe Single-Atom Catalyst for Oxygen Reduction Reaction

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Energy & Environmental Materials 2023年第2期6卷 303-310页

作者： Changli Chen Haijing Li Jingzhao Chen Dong Li Wenxing Chen juncai Dong Mengru sun Yujing Li Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China

Fe single-atom catalysts(Fe-SACs)have been extensively studied as a highly efficient electrocatalyst toward the oxygen reduction reaction(ORR).Nonetheless,they suffer from stability issue induced by dissolution of Fe metal center and the OH^(−)blocking.Herein,a surface molecular engineering strategy is developed by usingβ-cyclodextrins(CDs)as a localized molecular encapsulation.The CD-modified Fe-SAC(Fe-SNC-β-CD)shows obviously improved activity toward the ORR with 0.90 V,4.10 and 4.09 mA cm^(-2)for E_(1/2),J_(0)and Jk0.9,respectively.Meanwhile,the Fe-SNC-β-CD shows the excellent long-term stability against aggressive stress and the poisoning.It is confirmed through electrochemical investigation that modification ofβ-CD can,on one hand,regulate the atomic Fe coordination chemistry through the interaction between the CD and FeN_(x) moiety,while on the other mitigate the strong adsorption of OH^(−)and function as protective barrier against the poisoning molecules leading to enhanced ORR activity and stability for the Fe-SACs.The molecular encapsulation strategy demonstrates the uniqueness of post-pyrolysis surface molecular engineering for the design of single-atom catalyst.

关键词： oxygen reduction reaction singe atom catalyst stability surface molecular engineering

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Solid-state synthesis and electrochemical properties of SmVO_4 cathode materials for low temperature SOFCs

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Rare Metals 2006年第Z1期25卷 240-242页

作者： sun Xueli LI Song sun juncai Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

A new cathode material fabricated by solid state reaction method was reported. The SmVO4 powder was obtained by firing the mixture of Sm2O3 and V2O5 powders in the temperature range of 700-1200 ℃. Its structure was identified by X-ray diffraction method and the electrochemical properties of SmVO4 as cathodes for solid oxide fuel cells (SOFCs) were investigated in single unit cell at the temperature ranged from 450-550 ℃. The results of the single fuel cell unit show that the maximum current densities are 641, 797, 688 mA·cm-2 and the maximum power output are 165, 268, 303 mW·cm-2 and the open circuit voltage are 1.04, 0.96, 0.92 V at 450, 500 and 550 ℃, respectively.

关键词： SOFC SmVO4 cathode solid-state reaction electrochemical properties

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A new candidate as the cathode material for intermediate and low temperature SOFCs

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Rare Metals 2006年第Z1期25卷 213-217页

作者： LI Song sun Xueli WEN Zhongsheng sun juncai Institute of Materials and Technology Dalian Maritme University Dalian 11606 China Institute of Materials and Technology Dalian Maritme University Dalian 11606 China Institute of Materials and Technology Dalian Maritme University Dalian 11606 China Institute of Materials and Technology Dalian Maritme University Dalian 11606 China

In order to develop the new cathode materials suitable for intermediate and low temperature solid oxide fuel cells (IT/LTSOFCs), LaNi1-xFexO3 (x=0.4-0.8) (LNF) materials were synthesized using coprecipitation method. Their structures and morphologies were investigated by XRD and SEM, and their electronic conductivities at different temperatures were measured by dc four terminal method. Fuel cells were fabricated to evaluate the electrochemical properties of the LNF materials as cathodes at different temperatures. The performance of 450-497 mW·cm-2 was obtained in the temperature region of 580-650 ℃ for the LaNi0.2Fe0.8O3 cathode, and of 209-227 mW·cm-2 at 400-500 ℃ for the LaNi0.4Fe0.6O3. The excellent fuel cell performances indicate that the LNF materials are good cathodes for IT/LTSOFCs.

关键词： LaNi1- xFexO3 cathode materials coprecipitation method IT/LTSOFC

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Surface stability and conductivity of a high Cr and Ni austenitic stainless steel plates for PEMFC

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Rare Metals 2006年第Z1期25卷 229-234页

作者： TIAN Rujin sun juncai WANG Jianli Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

In order to use stainless steel as bipolar plate for PEMFC, electrochemical behavior of a high Cr and Ni austenitic stainless steel was studied in the solutions containing different concentration of H2SO4 and 2 mg·L-1 F-, and interfacial contact resistance was measured after corrosion tests. The experimental results show that the passive current density lowers with decreasing the concentration of H2SO4. The interfacial contact resistance between carbon paper and passive film formed in the simulated PEMFC environment is higher than the goal of bipolar plate for PEMFC. Surface conductivity should be further reduced by surface modification.

关键词： austenitic stainless steel bipolar plate passive film interfacial contact resistance

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Plain carbon steel bipolar plates for PEMFC

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Rare Metals 2006年第Z1期25卷 235-239页

作者： WANG Jianli sun juncai TIAN Rujin XU Jing Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Basic Science Department Changchun University of Technology Changchun 130012 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

Bipolar plates are a multifunctional component of PEMFC. Comparing with the machined graphite and stainless steels, the plain carbon steel is a very cheap commercial metal material. In this paper, the possibility of applying the plain carbon steels in the bipolar plate for PEMFC was exploited. In order to improve the corrosion resistance of the low carbon steel in the PEMFCs′ environments, two surface modification processes was developed and then the electrochemical performances and interfacial contact resistance (ICR) of the surface modified plate of plain carbon steel were investigated. The results show that the surface modified steel plates have good corrosion resistance and relatively low contact resistance, and it may be a candidate material as bipolar plate of PEMFC.

关键词： plain carbon steel bipolar plate corrosion resistance interfacial contact resistance

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